William mayer



(No Model.)

W. MAVER, Jr.

LOCAL CIRCUIT FOR QUADRUPLBX TBLEGRAPHS. No. 340,136.- Patented Apr. 20, 1886.

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UNITED STATES PATENT omen.

WILLIAM MAVER, JR., OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO THE BALTIMORE AND OHIO TELEGRAPH COMPANY, OF BALTIMORE, MD.

LOCAL CIRCUIT FOR QUADRUPLEX TELEGRAPHS.

SPECIFICATION forming part of Letters Patent lbl'o. 340,136, dated April 20, 1886. Application filed September 5, 1885. Serial No. 176,241. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM Mayne, J r., a citizen of the United States. residing in Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Qnadruplex Telegraphs, of which the following is a specification.

The invention relates to the organization of IO apparatus for receiving two messages simultaneously transmitted over a single conductor in which a neutral and a polar relay are employed.

The special object of the invention is to pro- Vide means for preventing false signals from being given by the neutral relay when the po larity of the current employed is reversed for operating the polar relay.

It is customary to employ currents of a given strength irrespective of their polarity for operating the neutral instrument, and currents of a given polarity and having a strength which may be less than that employed foroperating the first instrument for operating the polar instrument. WVhen asignal is being received by the firstorso-callet neutral inst-rument,and a reversal occurs in the polarity of the current for the purpose of operating the other instrument, then a moment of no current occurs, and 0 unless provision is made a false signal will be given when the armature of the neutral instrument falls away from its eleetro-magnet. The neutral instrument is usually employed to control the connections of a local circuit in- 5' eluding the sounder. This sounder may be constructed to respond either to the completion or to the interruption of the local circuit, as desired.

By the present invention a device is applied 0 to the armature of the second or polarized relay or receiving=instrument which is operated by its movement to interrupt the local circuit of the neutral relay at a second point at the moment a reversal occurs, such as would otherwise cause the said circuit to be completed, so

that the local circuit will remain open notwithstanding the movement of the armaturelever of the neutral relay. By reason of this organization a greater tension may be applied a conductor, 1.

to the armature of the neutral relay, because it may fall against its contact-stop without producing a signal.

In a patent of J. \V. Larish, No. 329,749, there is shown an organization of apparatus for preventing false signals, in which a circuit vent false signals by introducing through the instrumentality,of the armature of the polar relay a battery opposing that which would otherwise tend to produce a false signal. The organization claimed by me differs from these, as will hereinafter appear.

The accompanying drawing is a diagram illustrating the organization of apparatus.

Referring to this, L represents a main line leading through two receiving'instruments, R and R. The former of these is a neutral and the latter a polarized relay. The armaturelever r of the first relay is provided with afront stop, a, and a back contact-stop, a The lever is connected with one pole ofa battery, 0, by The remaining pole of this battery is connected by a conductor, 2, with a contact-lever, b", which will be hereinafter 8o described, and a similar contactlever, b, is connected by a conductor, 3, through the coils of an electro-magnet, S, constituting the sounder designed to respond to the operation of the relay R. The conductor 3 leads 8 from this magnet to the contact-stop a.

The polarized relay R is provided with an armatu relevern, playing between the two contact-levers b and b", and provided with a front contact-stop, c. The lever r" is connected by 0 a conductor, 4, with one pole ofa battery, 0 The other pole of this battery is connected by a conductor, 5, with the coils of the electro' magnet 0f the sounder S", and a conductor, 5, leads from this magnet to the stop '0'. The stop 0 is carried upon an insulated extension of the lever 12, and a similar stop, 0, may be applied to the other lever, b". Between the two levers b and b there is placed a restingcontact, (1, against which the levers I) and b are normally held by reason of the tension of the adjustable spring 8 and 8 applied thereto. A current of thestrength required to draw the armature-lever r of the neutral relay R forward, however, presses one or the other of the levers b or b away from the resting-stop d. So long as the two levers remain in contact with the stop d, the circuit of the battery 0 will be complete from the armature r to the point a through the sounder S; but by the movement of the lever r in response to a current of the strength employed for actuating the neutral relay the circuit of the battery will be interrupted at the point (I. It will now be understood that should a reversal occur in the polarity of the current transmitted while the armature r is in its forward position the tendency will be for this armature lever to fall back by reason of the momentary cessation of current upon the line, and thus a false signal might be given by the sounder S. To prevent the occurrence of such a signal, the levers b and b are employed, and it will be understood that before the armature-lever r can have passed into contact with the stop a the lever 1* will have moved the lever I) or b away from the stop 61 accordingly as the armature-lever is moved toward one or the other of the contact-levers, so that the circuit of the battery 0 will be interrupted notwithstanding the movement of the lever r. Should it be desired to allow the lever r to fall back before the signal transmitted through the polarized relay is ended, a diminution in the strength of the current through the line will allow this lever r to fall back and at the same time permit the lever r to fall away from one or the other of its electro-magnets a sufiicient distance to allow the lever b or b" to be again brought into contact with the stop cl. The springs s" and s are for this reason adjusted so that a current of the strength required for operating the relay R will not over come their tension, but a current of the strength required for operating the relay R i will produce in the polarized relay sufficient magnetism to cause the lever r to move the lever b or b away from the resting-stop d.

The organization may be such that there will normally be upon the lines. current ofthe strength required to draw the armature 9" of the relay R forward, as shown in the drawing. Then the sounder S will respond to diminutions in theline-current and the sounder S to reversals in polarity. On the otherhand, the position shown in the drawing may be that assumed when the sounder S is in operation, a current of greater than normal strength being upon the line. Either method,it is evident,is applicable to the system.

I claim as my invention- 1. The combination, substantially as hereinbefore set forth, with a polarized and a neutral relay, of a local circuit the connections of which are cont-rolled by said neutral relay, two contact-levers applied to the lever of said polarized relay and included in said local circuit, a contact-stop.for said levers through which the connections between said levers are normally completed, and means for causing one or the other of said levers to be separated from said 'stop by currents of the strength required to operate said neutral relav.

2. The combination, substantially as hereinbefore set forth, with a polarized and a neutral relay,and a sounder responding to the movements of the neutral relay, of a local battery for actuating said sounder, a circuit controlling device applied to the armature of the polarized relay for maintaining the circuit of said local battery, interrupted by the operation of said polarized relay when actuated by currents of the strength required for operating said neutral relay, and consisting of a stationary contact and two movable contacts resting against the same. except when one or the other is pressed away by the armature of the polarized relay.

3. The combination, substantially as hereinbefore set forth, of a polarized and a neutral relay, a sounder responding to the movements of the neutral relay, a circuit-controlling device applied to the polarized relay, a local battery having its circuit connections completed only through said circuit-controlling device, the coils of said sounder and the armature-lever and contact-point of the neutral relay.

4. The combination, substantially as hereinbefore set forth,with a main line, a polarized and a neutral relay, and a local battery having its circuit through the armature-lever of the neutral relay, of a circuit-interrupting device included in said circuit, and consisting of two contact-levers and a stop against which they tend to rest, one or the other of which levers may be pressed away from said'stop by the operation of said polar relay under the influence of currents of the strength employed for operating said neutral relay.

In testimony whereof I have hereunto subscribed my name this 4th day of September, A. D. 1885.

WILLIAM MAVER, JR.

Witnesses:

CAROLINE E. DAVIDSON, CHARLES-A. TERRY.

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